Resources Contact Us Home
Method for enhancing electrode surface area in DRAM cell capacitors

Image Number 3 for United States Patent #7573121.

Methods for forming the lower electrode of a capacitor in a semiconductor circuit, and the capacitors formed by such methods are provided. The lower electrode is fabricated by forming a texturizing underlayer and then depositing a conductive material thereover. In one embodiment of a method of forming the lower electrode, the texturizing layer is formed by depositing a polymeric material comprising a hydrocarbon block and a silicon-containing block, over the insulative layer of a container, and then subsequently converting the polymeric film to relief or porous nanostructures by exposure to UV radiation and ozone, resulting in a textured porous or relief silicon oxycarbide film. A conductive material is then deposited over the texturizing layer resulting in a lower electrode have an upper roughened surface. In another embodiment of a method of forming the lower electrode, the texturizing underlayer is formed by depositing overlying first and second conductive metal layers and annealing the metal layers to form surface dislocations, preferably structured as a periodic network. A conductive metal is then deposited in gaseous phase, and agglomerates onto the surface dislocations of the texturizing layer, forming nanostructures in the form of island clusters. The capacitor is completed by depositing a dielectric layer over the formed lower electrode, and forming an upper capacitor electrode over the dielectric layer. The capacitors are particularly useful in fabricating DRAM cells.

  Recently Added Patents
User interface for stylus-based user input
Dryer bar
Identifying a wireless network device across factory resets
Acquiring access to a token controlled system resource
Image processing device having erase control
Wireless communication system, wireless communication apparatus, and wireless communication method
Fake exception handler detection
  Randomly Featured Patents
Large-aperture telephoto lens
Computer processor with fairness monitor
Customized memorial
End cap for a container
Composition of diene rubber reinforced with a white filler, comprising a multi-functionalized polyorganosiloxane as coupling agent (white filler/elastomer)
Solid state scanning device
Aggregated trading system
Respiratory masks having valves and other components attached to the mask by a printed patch of adhesive
Cheese-making trays with removable stores
NAND flash memory devices having shielding lines between wordlines and selection lines